/*
 * Licensed to Crate under one or more contributor license agreements.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.  Crate licenses this file
 * to you under the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.  You may
 * obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.  See the License for the specific language governing
 * permissions and limitations under the License.
 *
 * However, if you have executed another commercial license agreement
 * with Crate these terms will supersede the license and you may use the
 * software solely pursuant to the terms of the relevant commercial
 * agreement.
 */

package io.crate.planner.node.dql.join;

public enum JoinType {
    CROSS,
    INNER,
    LEFT {
        @Override
        public JoinType invert() {
            return RIGHT;
        }
    },
    RIGHT {
        @Override
        public JoinType invert() {
            return LEFT;
        }
    },
    FULL,
    SEMI {
        @Override
        public JoinType invert() {
            throw new UnsupportedOperationException("Tables of a SEMI Join cannot be inverted");
        }

        @Override
        public boolean supportsInversion() {
            return false;
        }
    },
    ANTI {
        @Override
        public JoinType invert() {
            throw new UnsupportedOperationException("Tables of a ANTI Join cannot be inverted");
        }

        @Override
        public boolean supportsInversion() {
            return false;
        }
    };

    public JoinType invert() {
        return this;
    }

    public boolean supportsInversion() {
        return true;
    }

    public boolean isOuter() {
        return ordinal() > INNER.ordinal() && ordinal() <= FULL.ordinal();
    }
}
